Spondee: a two-syllable verse foot in which both syllables are stressed. For instance: SPON.DEE. It is unique in the English language as it is the only metrical foot that does not contain an unstressed syllable.

King Lear example

Lear: You do me wrong to take me out o’ the grave.
Thou art a soul in bliss; but I am bound
Upon a wheel of fire, that mine own tears
Do scald like molten lead

Kent: Vex not his ghost. O, let him pass! He hates him much
That would upon the rack of this tough world
Stretch him out longer

Lear: Howl, howl, howl, howl! O, you are men of stones:
Why should a do, a horse, a rat, have life,
And thou no breath at all? Thou’lt come no more,
Never, never, never, never, never!

Robert Frost example

Men work together,' I told him from the heart,
'Whether they work together or apart.'
(last lines of The Tuft of Flowers)